41G iMUSCI. Ihjimum. 



hixse, costate to uljove tlio middle ; periclitutial leaves squarrose : capsule horizontal, 

 oblong and suboylindiical, contracted below the throat wlien dry : teeth orange ; 

 jirocesses yellow, dehiscent; cilioUe 1 or 2, a half shorter. — Muse. llib. t. 15, lig. '1 ; 

 Fl. Dan. t. 2562, fig. 2 ; Sulliv. i Lesci. :Musc. Am.-Bor. Exsicc. 2 ed. n. -13.3. 

 HurhynchiwH ISlokesii, Ihuch it iSchiuii). 1. c., t. 52G. 



On shaded ground and rocks, common {LkjcIow, Bolandcr) ; Vancouver Island (Lijnll, Wood) ; 

 Europe. 



27. H. Oreganum, Sulliv. Very near the last, but larger and more robust, the 

 creeping stems (j to 12 inches long or more, once or twice divided, regularly and 

 closely pinnated : leaves thinner and firmer, the areolatioa longer and narrower ; 

 perichaitial leaves retiexed. — jNIem. Amer. Acad. n. ser. iv. 172, and Muse. AVilkes 

 Exp. IG, t. 13, B; Sulliv. & Lesq. 1. c, n. 431. 



On decaying logs or on tlie ground in forests {IliQcIutc, Brewer, Lolaudcr) ; I'uget Sound {Pick- 

 eriny); Vancouver Island, H'ood. 



28. H. COlpophyllum, Sulliv. Of similar habit, rather small : leaves scarious, 

 very concave, spreading, ovate, very shortly acuminate, margin Hat, serrulate, costa 

 slender, the dentate tip excurrent above the middle, areolation very narrowly hex- 

 agonal-rhombic ; perichtetial leaves oblong-lanceolate, Ituig-acuminate, nerveless, 

 spreading above : capsule oblong-cylindric, cernuous, .slightly curved, twice longer 

 than the straight stout-beaked operculum : ciliohe 2, e(pialling the teeth. — Eurht/ii- 

 diium colpojihjlluin, Sulliv. Icon. Muse. Suppl. IT), t. 71. 



California, lUijcluw. 



-1- -4— Ramificnt Ion fascicled and someicJint dendroid : learrs complanate : areo- 

 lation qiiadrate-rlionihic above, narrutrli/ obluny l/e/oic: pedicels smooth. — 

 Thammum. {Tliarnnium, Schinip.) 



29. H. Bigelovii, Sulliv. Secondary stems arcuate-ascending, subfasciculately 

 branched, 1 to U inclies high, rather stiff, in close mats: leaves bright green, 

 spreading in two ranks, long-oblong, shortly acuminate, coarscily .serrate above, mar- 

 gin inflexed on one side, costa ceasing below the ajiex ; i)ericluetial leaves lanceolate, 

 linear-acuminate and serrate, suberect : llowers dioecious : capsule oblong-oval, in- 

 clined, with distinct collum, a little exceeding the strai-htish 0})erculum : ciliohe 

 in pairs, strongly a])pendiculate, nearly equalling the processes. — I'acif. i{. IJep. iv. 

 189, t. 8 ; Sulliv. it Le-s-i. 1. c, n. 423. 



In valleys of the Coast Kangcs north of the bay of San iManci.-co, on shaded rocks, Bigchv; 

 Brewer, Bolauder. 



H. Ai.i-KGUANIF.NSF,, Muell. Larger, 2 or 3 inches high ; leaves less distinctly coniydanate, 

 ovate-oblong, more concave, obtusish, coarsely serrate, costa dentate on the liack : flowers liisexiuil 

 or monoecious : operculum more obli(|ue. — Sulliv. Icon. Muse. l(il, t. 103 ; Sulliv. k Lescp 1. c, 

 n. 288. Tliamniuiii. J!lnjl„niinisr, liiucii .t S.liimp. //. mckcroides. Mitt, in Jouni. Linn. Soc. 

 viii. 38, not Hook. Vancouver Island ( Wood) aii.l .\tlantic States. 



§ 3. Leaves smooth, vwsthj complanate or more or less senind, often shorth/ cos- 

 tate, bicostate, or nerveless : areolation mostly elo)ii/ated rhombic : pedicels 

 smooth: opterculum convex-conic 



* Trre(jnlarly and sparinyhj branched, stolon iferavs : leares shinin;/, thin, dis- 

 tichoushj complanate, orate or orate-lanceolate, nerveless or shortly bicostate, 

 visually entire ; areolation narrowly rhomhic-liexayonal : mostly inonoecioiis. — 

 Plagiotheciu.m. (Playiothecium, Schinq).) 



-1— Fcristome-teeth closely jointed ; ciliuhc present. 



30. H. denticulatum, Linn. Stems i)rostrate, 2 or 3 inches long, with erect 

 subfasciculate l>raiiclies : leaves light green and glossy, obliquely ovate, short-acumi- 

 nate, concave with margin recurved below, bicostate at base ; areolation long-rhombic, 

 quadrate at the angles : capsule arcuate-oblong or -cylindric, on a red curved pedicel 



